bsd/netat/adsp_Timer.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  *      Copyright (c) 1990, 1996-1998 Apple Computer, Inc.
  24  *      All Rights Reserved.
  25  */
  26
  27 /*
  28  * Timer.c
  29  *
  30  * From v01.12  06/22/90 mbs
  31  *    Modified for MP, 1996 by Tuyen Nguyen
  32  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  33  */
  34
  35 #include <sys/errno.h>
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include <machine/spl.h>
  39 #include <sys/systm.h>
  40 #include <sys/kernel.h>
  41 #include <sys/proc.h>
  42 #include <sys/filedesc.h>
  43 #include <sys/fcntl.h>
  44 #include <sys/mbuf.h>
  45 #include <sys/socket.h>
  46 #include <sys/time.h>
  47
  48 #include <netat/sysglue.h>
  49 #include <netat/appletalk.h>
  50 #include <netat/at_pcb.h>
  51 #include <netat/debug.h>
  52 #include <netat/adsp.h>
  53 #include <netat/adsp_internal.h>
  54
  55 void TimerTick();
  56
  57 /*
  58  * TrashSession
  59  *
  60  * Cleanly abort a session that might be open.  Called if probe timer expires,
  61  * or from AppleTalk event handler (close or network gone away)
  62  *
  63  * Only call if the session is active (I.e. not for closed or listeners)
  64  *
  65  * INPUTS:
  66  *              session pointer
  67  * OUTPUTS:
  68  *              none
  69  */
  70 void TrashSession(sp)           /* (CCBPtr sp) */
  71     CCBPtr sp;
  72 {
  73
  74     sp->userFlags |= eTearDown;
  75     sp->removing = 1;
  76     sp->state = sClosed;
  77
  78     DoClose(sp, errAborted, 1);
  79 }
  80
  81
  82 /*
  83  * DoTimerElem
  84  *
  85  * INPUTS:
  86  *
  87  * OUTPUTS:
  88  *
  89  */
  90 void DoTimerElem(t) /* (TimerElemPtr t) */
  91     TimerElemPtr t;
  92 {
  93     CCBPtr sp;
  94
  95     sp = (CCBPtr)((Ptr)t - t->type); /* Recover stream pointer for this guy */
  96
  97     if (t->type == kFlushTimerType) { /* flush write data time just fired */
  98         if (sp->sData) {        /* If there's any data, flush it. */
  99             sp->writeFlush = 1;
 100             goto send;
 101         }
 102     } else if (t->type == kRetryTimerType) {
 103         if (sp->waitingAck) {
 104
 105             sp->waitingAck = 0;
 106             sp->sendSeq = sp->firstRtmtSeq;
 107             sp->pktSendCnt = 0;
 108             sp->resentData = 1; /* Had to resend data */
 109             sp->noXmitFlow = 1; /* Don't incr. max packets. */
 110
 111             if ((sp->pktSendMax /= 2) == 0) /* Back off on max # packets
 112                                              * sent */
 113                 sp->pktSendMax = 1;
 114
 115             if ((sp->roundTrip *= 2) > sp->probeInterval)
 116                 sp->roundTrip = sp->probeInterval;
 117             sp->rtmtInterval = sp->roundTrip + ((short)2 *
 118                                                 (short)sp->deviation);
 119             goto send;
 120         }
 121     } else if (t->type == kAttnTimerType) {
 122         if (sp->sapb) {         /* Unacknowledged attn pkt */
 123             sp->sendAttnData = 1;
 124             goto send;
 125         }
 126     } else if (t->type == kResetTimerType) {
 127         if (sp->frpb) {         /* Unacknowledged forward reset */
 128             sp->sendCtl |= B_CTL_FRESET;
 129             goto send;
 130         }
 131     } else if (t->type == kProbeTimerType) {
 132         if (sp->state == sOpen || sp->state == sClosing) {
 133             if (--sp->probeCntr == 0) { /* Connection died */
 134                 TrashSession(sp);
 135                 return;
 136             } else {
 137                 InsertTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer,
 138                                 sp->probeInterval);
 139                 sp->sendCtl |= B_CTL_PROBE;
 140                 goto send;
 141             }
 142         } else if (sp->state == sOpening) {
 143             if ((sp->openState == O_STATE_OPENWAIT) ||
 144                 (sp->openState == O_STATE_ESTABLISHED))
 145             {
 146                 if (--sp->openRetrys == 0) { /* Oops, didn't open */
 147                     sp->state = sClosed;
 148                     DoClose(sp, errOpening, 1);
 149                     return;
 150                 }               /* open failed */
 151                 else            /* Send packet again */
 152                 {
 153                     sp->sendCtl |= (sp->openState == O_STATE_OPENWAIT) ?
 154                         B_CTL_OREQ : B_CTL_OREQACK;
 155                     goto send;
 156                 }
 157             }                   /* we're opening */
 158         }
 159     }
 160
 161     else {
 162         dPrintf(D_M_ADSP, D_L_ERROR, ("DoTimerElem:Unknown timer type!\n"));
 163     }
 164
 165         return;
 166
 167 send:
 168     CheckSend(sp);
 169 }
 170
 171 void TimerTick_funnel(void *arg)
 172 {
 173         atalk_lock();
 174         TimerTick();
 175         atalk_unlock();
 176 }
 177
 178 static StopTimer;
 179
 180 /*
 181  * TimerTick
 182  *
 183  * Called 6 times per second
 184  * INPUTS:
 185  *
 186  * OUTPUTS:
 187  *
 188  */
 189 void TimerTick()                /* (void) */
 190 {
 191
 192     if (StopTimer) {
 193         return;
 194     }
 195     TimerQueueTick(&adspGlobal.slowTimers);
 196     TimerQueueTick(&adspGlobal.fastTimers);
 197     timeout(TimerTick_funnel, (caddr_t)0, HZ/6);
 198 }
 199
 200 void TimerStop()
 201 {
 202     StopTimer = 1;
 203     untimeout(TimerTick_funnel, (caddr_t) 0);
 204 }